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so I have a weird problem, when I'm watching a video online in full screen mode on Firefox 64, I can see my desktop wallpaper in the background when the there is a dark scene. It only happens with my profile account. It's kind of annoying actually. Does anyone know why this is happening? Thanks

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The solution is here: Strange "ghost images" / transparency effect in full-screen videos

TL;DR; -> Change layers.acceleration.force-enabled option to true in the about:config